From the letter column for Star Spangled War Stories #126 (April-May 1966):

“RK” being “Robert Kanigher,” natch. (Fake letter run to help dissuade similar letters from pouring in, or real reader comment pulled out and used as a lesson in what editors don’t want to see? No idea.)

From the same issue, an in-house ad that, I can only assume, resulted in the highest sales ever for any issue of Metal Men:

Mid-sixties DC in excelsis. Escalating war in Vietnam, the psychedelic era a-borning and near-revolution in Paris just around the corner, and DC editorial think “hotcha”, a term that would have been mocked as outmoded in an Andy Hardy movie, is the word on the street.